Is there a difference between the two kinds of Genesis cartridges

Review: Mega Drive / Genesis Mini 2 - Sega's Sequel Scores CD Support

Half Steps: A History of Console Upgrades, Part 2: Sega CD

Guide to All Game Cartridge Screwdriver Bits, Batteries, and Circuit Boards

Question about the two different covers on Reality's Edge : r/wargaming

Experience Retro Sega Games in 1080p With the New Mega Sg

If Sega had not made the mistake of stopping Genesis production to focus on Saturn, could this 16-bit console have come close to 50 million units sold as the SNES? - Quora

28 years later, a no-disc version of the Sega CD exists—and it rocks [Updated]

10 Best Shoot Em' Ups On The Sega Genesis

SEGA-Genesis-1-2-3-Information-Specs — Gametrog

Found some curious cartridges, wondering if anyone can explain : r/SEGAGENESIS